If CMAKE_SYSTEM_NAME is defined, CMake assumes we're cross-compiling,
which is not necessarily the case.
(From OE-Core rev: bd082c9be6191e67ea1b1bf10ce5e130a3433ab5)
Signed-off-by: Kyle Russell <bkylerussell@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>